Visual sealing device and method for pile holes in beaded karst caves

Abstract

This invention provides a visual sealing device for pile holes in beaded karst caves, belonging to the field of karst cave treatment technology for pile foundations. It includes: a steel casing, a karst cave scanning device, thin-walled protective rings, and a shear nail installation mechanism. The steel casing is installed at the karst cave pile hole, and the karst cave scanning device is clamped at the top of the steel casing. The karst cave scanning device is used to scan and record the interior of the karst cave. Multiple thin-walled protective rings are installed inside the karst cave pile hole to cover different karst caves. The shear nail installation mechanism is installed at the bottom of the karst cave scanning device to fix the thin-walled protective rings inside the karst cave. This invention uses the karst cave scanning device to scan the karst caves inside the pile hole, visualizing the distribution of karst caves. Corresponding thin-walled protective rings are designed and installed according to each layer of the karst cave to prevent concrete loss during pile foundation concrete pouring. The shear nail installation mechanism presses shear nails into the top, bottom, vertical edge overlap, and outside the outline of each karst cave to fix the thin-walled protective rings, thus achieving fixation.

Description

Technical Field

[0001] This invention relates to the field of pile foundation karst cave treatment technology, and in particular to a visual sealing device and method for pile holes in beaded karst caves. Background Technology

[0002] In geological conditions characterized by beaded karst caves, appropriate treatment of the karst caves within the pile holes is necessary to prevent concrete loss during pouring. Currently, extensive research has been conducted in China on the treatment and construction of pile holes in karst cave geological conditions.

[0003] In the prior art, a pile foundation karst cave treatment device (patent number CN219100004U) overcomes the limitation that traditional three-dimensional geological models can only provide a simple display. The pile foundation karst cave treatment device (patent number CN219100004U) solves the problems of excessive use of existing karst cave treatment materials, low operation efficiency, and high construction costs. A bridge pile foundation karst cave treatment construction method under strongly developed karst geological conditions (patent number CN115595979A) reduces the safety hazard of pile foundation collapse during excavation and avoids quality problems such as pile collapse or pile breakage caused by thick overburden and soft rock strata due to water seepage during pile core concrete pouring.

[0004] However, there are still problems such as the inability to visualize the karst caves inside the pile holes, and the inability to design and seal multi-layered beaded karst caves in layers. Summary of the Invention

[0005] This invention provides a visual sealing device for pile holes in beaded karst caves, which solves the defects of existing pile foundation karst cave treatment devices and achieves targeted sealing of pile holes in beaded karst caves.

[0006] This invention provides a visual sealing device for pile holes in beaded karst caves, comprising: a steel casing, a karst cave scanning device, thin-walled protective rings, and a shear nail installation mechanism; the steel casing is installed at the pile hole in the karst cave, and the karst cave scanning device is clamped at the top of the steel casing for scanning and recording the interior of the karst cave; after scanning, based on the information collected, multiple thin-walled protective rings are installed inside the pile hole in the karst cave to cover different karst caves; the shear nail installation mechanism is installed at the bottom of the karst cave scanning device to fix the thin-walled protective rings inside the karst cave.

[0007] According to the present invention, a sealing device for visualizing pile holes in a beaded karst cave is provided. The karst cave scanning device includes: a controller, a clamping mechanism, a telescopic rod, and a scanner. The clamping mechanism is telescopic, one end of which is connected to the controller, and the other end of which is clamped to the top of the steel casing. The controller controls the clamping mechanism to adjust the axial position of the controller. One end of the telescopic rod is connected to the bottom of the controller, and the controller can control the telescopic rod to extend or retract. The scanner is installed at the other end of the telescopic rod.

[0008] According to the present invention, a sealing device for visualizing pile holes in a beaded karst cave is provided. The karst cave scanning device further includes a reaction force device, which is installed on the telescopic rod. The reaction force device, through its support with the hole wall, ensures that the scanner does not shift position when scanning the hole wall.

[0009] According to the present invention, a sealing device for visualizing pile holes in a beaded karst cave is provided, wherein the scanner is provided with a scanner gear, the telescopic rod is provided with a first telescopic rod gear, the scanner gear meshes with the first telescopic rod gear, the controller can control the scanner gear to rotate, and the scanner rotates along the telescopic rod.

[0010] According to the present invention, a sealing device for visualizing pile holes in a beaded karst cave is provided. The clamping mechanism includes a support arm and a clamping leg. One end of the support arm is connected to the clamping leg, and the other end of the support arm is connected to the controller. The support arm is telescopic.

[0011] According to the present invention, a sealing device for visualizing pile holes in a beaded karst cave is provided, wherein the thin-walled protective ring is a rectangular sheet of iron, the thickness of the thin-walled protective ring is greater than 2mm, the horizontal side length of the thin-walled protective ring is 20cm longer than the perimeter of the pile foundation, and the vertical side of the thin-walled protective ring is about 60cm longer than the length of the karst cave layer to be sealed.

[0012] According to the present invention, a visual sealing device for pile holes in a beaded karst cave is provided. The shear nail installation mechanism includes: a reaction seat, a positioning rod, and a pressing machine. The reaction seat is installed on the telescopic rod. The positioning rod is telescopic. One end of the positioning rod is connected to the reaction seat, and the other end of the positioning rod is connected to the pressing machine. The controller controls the telescopic extension and retraction of the positioning rod to align with the position where the shear nail needs to be driven in. The pressing machine can drive the shear nail through the thin-walled protective ring into the hole wall.

[0013] According to the present invention, a sealing device for visualizing pile holes in a beaded karst cave is provided, wherein a second telescopic rod gear is provided on the telescopic rod, a reaction seat gear is provided on the reaction seat, the reaction seat gear meshes with the second telescopic rod gear, the controller can control the rotation of the reaction seat gear, and the reaction seat rotates along the telescopic rod.

[0014] According to the present invention, a sealing device for visualizing pile holes in a beaded karst cave is provided, wherein the reaction force is provided in multiple parts.

[0015] This invention also provides a method for visualizing and sealing pile holes in beaded karst caves, comprising the following steps: hoisting and clamping a karst cave scanning device onto a steel casing, adjusting the karst cave scanning device so that it is located at the center of the pile hole; turning on the karst cave scanning device to scan and measure the karst cave, recording and storing the information; fabricating a thin-walled protective ring based on the scanning results of the karst cave scanning device; rolling the thin-walled protective ring into a cylinder and placing it inside the karst cave to cover it; fixing the thin-walled protective ring using a shear nail installation mechanism until all layers of karst caves are sealed; and pouring concrete for the pile foundation.

[0016] The present invention provides a visualization sealing device for pile holes in beaded karst caves. By scanning the karst caves inside the pile hole with a karst cave scanning device, the distribution of the karst caves is visualized and stored. Based on the distribution characteristics of each layer of the karst cave, a corresponding thin-walled protective ring is designed and installed for each layer to prevent concrete loss during the pouring of the pile foundation concrete. Combined with the scanned and stored data, a shear nail installation mechanism presses shear nails into the top, bottom, vertical edge overlap, and outer contour of each karst cave to fix the thin-walled protective ring, thereby achieving the fixation of the thin-walled protective ring. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the cave scanning device provided by the present invention;

[0019] Figure 2 This is a cross-sectional view of the karst cave inside the pile hole provided by the present invention;

[0020] Figure 3 This is a schematic diagram of the controller provided by the present invention;

[0021] Figure 4 This is a schematic diagram of the installation between the scanner and the telescopic pole provided by the present invention;

[0022] Figure 5 This is a schematic diagram showing the relationship between the first telescopic rod gear and the scanner gear provided by the present invention;

[0023] Figure 6 This is a schematic diagram of the scanner scanning principle provided by the present invention;

[0024] Figure 7 This is a visualized coordinate graph of the scanner scanned by the present invention;

[0025] Figure 8 This is a plan view of the thin-walled retaining ring provided by the present invention;

[0026] Figure 9 This is an installation cross-sectional view of the thin-walled retaining ring provided by the present invention;

[0027] Figure 10 This is a vertical cross-sectional view along the retaining ring provided by the present invention;

[0028] Figure 11 This is a schematic diagram of the card bar structure provided by the present invention;

[0029] Figure 12 This is a schematic diagram of the structure of the cave scanning device and shear nail installation mechanism provided by the present invention;

[0030] Figure 13 This is a structural schematic diagram of the shear stud installation mechanism provided by the present invention.

[0031] Figure label:

[0032] 10. String of beads caves;

[0033] 20. Hole wall;

[0034] 100. Steel casing;

[0035] 200. Cave scanning equipment;

[0036] 210. Controller; 220. Clamping mechanism; 221. Support arm; 222. Clamping leg; 230. Telescopic rod; 231. First telescopic rod gear; 240. Scanner; 241. Scanner gear; 242. Scanning hole; 250. Reaction device; 260. Controller;

[0037] 300, thin-walled protective ring;

[0038] 310, retaining ring; 320, small retaining angle; 330, large retaining angle; 340, retaining rod;

[0039] 410. Reaction seat; 420. Positioning rod; 430. Press-in machine; 440. Connecting bolt; 450. Shear stud. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0041] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In the description of this invention, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" indicate the orientation or positional relationship, which is generally based on Figure 1 The orientation and position of the sealing device for the visible pile hole at the beaded cave shown are for the purpose of describing the invention and simplifying the description only. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of the invention. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0044] This invention provides a visual sealing device for pile holes in beaded karst caves, see [link / reference]. Figure 1 , Figure 8 and Figure 12 The system includes: a steel casing 100, a cave scanning device 200, thin-walled protective rings 300, and a shear nail installation mechanism; the steel casing 100 is installed at the cave pile hole, the cave scanning device 200 is clamped on the top of the steel casing 100, and the cave scanning device 200 is used to scan and record the interior of the cave; after scanning, based on the information collected by the scan, multiple thin-walled protective rings 300 are installed in the cave pile hole to cover different caves; the shear nail installation mechanism is installed at the bottom of the cave scanning device 200 to fix the thin-walled protective rings 300 inside the cave.

[0045] See Figure 1 , Figure 2 and Figure 8 , Figure 2The diagram shows the karst caves before scanning. The karst cave scanning device 200 scans the karst caves inside the pile hole to visualize the distribution of the karst caves and stores the data. Based on the distribution characteristics of each layer of the karst caves, a corresponding thin-walled protective ring 300 is designed and installed for each layer to prevent concrete loss during the pile foundation concrete pouring process. Combining the scanned and stored data, the shear nail installation mechanism presses shear nails into the top, bottom, vertical edge overlap, and outside the outline of each karst cave to fix the thin-walled protective ring 300, thereby fixing the thin-walled protective ring 300.

[0046] In one embodiment, the cave scanning device 200 includes: a controller 210, a clamping mechanism 220, a telescopic rod 230, and a scanner 240; the clamping mechanism 220 includes a telescopic support arm, one end of the clamping mechanism 220 is connected to the controller 210, and the other end of the clamping mechanism 220 is clamped to the top of the steel casing 100; the controller 210 controls the clamping mechanism 220, thereby adjusting the position of the controller 210; one end of the telescopic rod 230 is connected to the bottom of the controller 210, and the controller 210 can control the telescopic rod 230 to extend and retract; the scanner 240 is installed at the other end of the telescopic rod 230.

[0047] The clamping mechanism 220 clamps the cave scanning device 200 on the top of the steel casing 100, supporting the entire cave scanning device 200. The controller 210 adjusts its position by adjusting the clamping mechanism 220.

[0048] For example, the controller 210 has a built-in control system and a level. The clamping mechanism 220 can adjust the controller 210 to be horizontal. At the same time, the controller 210 is equipped with a GPS positioning system, which can be adjusted by the clamping mechanism 220 according to the imported pile foundation coordinates so that the controller 210 is located at the center of the pile foundation.

[0049] For example, see Figure 3 The controller 210 has a built-in wireless transmission module, which can wirelessly connect to the controller 260. The controller 260 can control the controller 210 from a certain distance.

[0050] For example, the telescopic rod 230 is hinged to the controller 210, and the telescopic rod 230 can extend into the pile hole, ensuring that the scanner 240 can extend into the pile hole to any depth.

[0051] In one embodiment, see Figure 1 The clamping mechanism 220 includes a support arm 221 and a clamping leg 222. One end of the support arm 221 is connected to the clamping leg 222, and the other end of the support arm 221 is connected to the controller 210. The support arm 221 is telescopic.

[0052] For example, the clamping leg 222 is U-shaped and can be loosened and tightened by the controller 210 to achieve the purpose of clamping the entire device on the top of the steel casing 100.

[0053] In one embodiment, see Figure 1 The cave scanning device 200 also includes a reaction device 250, which is mounted on the telescopic rod 230. The reaction device 250, through its support with the cave wall, prevents the scanner 240 from shifting its position when scanning the cave wall.

[0054] For example, a vertical measurement system is provided at the bottom of the telescopic pole 230. The vertical measurement system is electrically connected to the controller 210, which can monitor the verticality of the telescopic pole 230. The controller 210 adjusts the reaction force device 250 to ensure that the scanner 240 is located at the center of the pile.

[0055] For example, multiple reaction devices 250 are provided to better adjust the position of the scanner 240.

[0056] In one embodiment, see Figures 4-5 The scanner 240 is equipped with a scanner gear 241, and the telescopic rod 230 is equipped with a first telescopic rod gear 231. The scanner gear 241 meshes with the first telescopic rod gear 231. The controller 210 can control the scanner gear 241 to rotate, and the scanner 240 rotates along the telescopic rod 230.

[0057] The scanner 240 performs a 360° scan of the hole wall. The scanner 240 emits light during scanning and stores and analyzes the scanned data.

[0058] For example, the scanner 240 is aligned with the 0 point and scanned clockwise for one revolution, and the scanned data is stored. After the scanner 240 returns to the 0 point, the controller 210 extends the telescopic rod 230 downward by a length of 2 * pile hole radius * tanψ, where ψ is the maximum angle that the scanner 240 can scan.

[0059] like Figures 6-7 As shown, for any point a on the borehole wall inside the pile hole, let the depth coordinate of the location of the scanner 240 be h1, the rotation angle be θ, and the radius of the pile hole be r. Then the coordinates of point a are (θ*r, h1-r*tanα), and the coordinates of point b are (θ*r, h1+r*tanβ). An array is established, and the coordinates of each point and the scanned unit image are stored as elements in the array. After the scan is completed, a two-dimensional scan image is formed, which can display the distribution and size of each layer of karst caves.

[0060] In one embodiment, see Figures 8-11 The thin-walled retaining ring 300 is a rectangular sheet of iron. The thickness of the thin-walled retaining ring 300 is greater than 2mm. The horizontal side length of the thin-walled retaining ring 300 is 20cm longer than the perimeter of the pile foundation. The vertical side of the thin-walled retaining ring 300 is about 60cm longer than the length of the karst cave layer to be sealed, and 30cm on each side, to ensure that each layer of karst cave can be sealed.

[0061] The installation position of the thin-walled retaining ring 300 is located at Figure 2 Location of the Zhongchuanzhu Cave 10.

[0062] The thin-walled retaining ring 300 has retaining rings 310 spaced apart on one vertical side. The other side is cut into a concave-convex shape, so that the protruding part passes through the corresponding retaining ring 310. Small retaining angles 320 and large retaining angles 330 are welded at each protruding position. A retaining rod 340 is inserted between the retaining rings 310 and the small retaining angles 320 along the vertical side of the thin-walled retaining ring 300 to achieve the purpose of making the thin-walled retaining ring 300 into a cylindrical shape. The width of the small retaining angle 320 is less than the length of the inner short side of the retaining ring 310 to ensure that the retaining rod 340 can pass through the retaining ring 310 when it is pulled out. The large retaining angle 330 is greater than the length of the inner short side of the retaining ring 310 to prevent the thin-walled retaining ring 300 from fully opening when the retaining rod 340 is pulled out. One end of the electrically operated clamp holds the thin-walled protective ring 300, and the other end is used to hoist the cylindrical thin-walled protective ring 300 into the karst cave layer inside the pile hole via a pulley. The hoisting rope is then pulled out of the clamp 340, which allows the thin-walled protective ring 300 to open and cover the karst cave layer.

[0063] In one embodiment, see Figures 12-13 After the thin-walled protective ring 300 is opened, it covers the karst cave. The shear nail installation mechanism includes: a reaction seat 410, a positioning rod 420, and a pressing machine 430. The reaction seat 410 is installed on the telescopic rod 230. The positioning rod 420 is telescopic. One end of the positioning rod 420 is connected to the reaction seat 410, and the other end of the positioning rod 420 is connected to the pressing machine 430. The controller 210 controls the telescopic extension and retraction of the positioning rod 420 to align with the position where the shear nail needs to be driven in. The pressing machine 430 can drive the shear nail through the thin-walled protective ring 300 and into the hole wall.

[0064] The reaction force 250 provides support to the hole wall, providing a reaction force during the driving of the shear stud into the hole.

[0065] For example, the other end of the positioning rod 420 is connected to the presser 430 by a connecting bolt 440, which facilitates the disassembly and assembly of the presser 430 and enables maintenance and other work on the presser 430.

[0066] In one embodiment, a second telescopic rod 230 gear is provided on the telescopic rod 230, and a reaction seat 410 gear is provided on the reaction seat 410. The reaction seat 410 gear meshes with the second telescopic rod 230 gear, such as... Figure 5 As shown, the installation method of the gear of the reaction seat 410 and the gear of the second telescopic rod 230 is the same as the installation method of the scanner gear 241 and the gear of the first telescopic rod 231. The controller 210 can control the rotation of the gear of the reaction seat 410, and the reaction seat 410 rotates along the telescopic rod 230.

[0067] This invention provides a method for visualizing and sealing pile holes in beaded karst caves, comprising the following steps:

[0068] Step 1: Hoist the karst cave scanning device 200 and clamp it onto the steel casing 100. Adjust the karst cave scanning device 200 so that it is located at the center of the pile hole.

[0069] The karst cave scanning device 200 is hoisted and clamped onto the steel casing 100. The pile foundation coordinates and the top elevation of the steel casing 100 are input into the controller 260, so that the scanner 240 is located at the pile center and at the same elevation as the top of the steel casing 100.

[0070] Step 2: Turn on the cave scanning equipment 200 to scan and measure the cave, record and store the information.

[0071] Align the scanner 240 with the 0 point and scan clockwise for one revolution, storing the scanned data. After the scanner 240 returns to the 0 point, the controller 210 extends the telescopic rod 230 downwards by a length equal to 2 * pile hole radius * tanψ, where ψ is the maximum angle that the scanner 240 can scan.

[0072] Step 3: Fabricate a thin-walled protective ring 300 based on the scanning results of the cave scanning equipment 200.

[0073] The thin-walled protective ring 300 has a retaining ring 310 spaced on one side of its vertical edge, and the other side is cut into a concave-convex shape so that the protruding part passes through the corresponding retaining ring 310. Small retaining angle 320 and large retaining angle 330 are welded at each protruding position.

[0074] Step 4: Roll the thin-walled protective ring 300 into a cylinder and place it inside the cave so that the thin-walled protective ring 300 covers the cave.

[0075] After the thin-walled protective ring 300 is made, it is rolled into a cylinder. The clamping rod 340 is inserted between the clamping ring 310 and the small clamping angle 320, so that the diameter of the cylinder is smaller than the diameter of the pile hole. The cylinder is hoisted into the pile hole along the side wall of the protective ring using electrically openable clamps and a hoisting rope. The protective ring is fixed to the ground around the protective ring using a bracket with pulleys. The hoisting rope is marked with graduations to make it easy to determine the position of the thin-walled protective ring 300 when it is hoisted to the corresponding hole. The clamping rod 340 is slowly hoisted from bottom to top, so that the thin-walled protective ring 300 opens and covers the karst cave.

[0076] Step 5: Use a shear nail installation mechanism to fix the thin-walled protective ring 300 until all the karst caves are sealed.

[0077] The cave scanning device 200 is re-erected on top of the casing. The scanned and stored data is transmitted to the positioning rod 420, which specifies the location for inserting shear nails. The pressing machine 430 then inserts the shear nails through the thin-walled retaining ring 300 into the hole wall. The shear nail insertion locations include rows 5cm and 10cm above the top edge of a cave layer, spaced 10-20cm apart; rows 5cm and 10cm below the bottom edge of the same cave layer, spaced 10-20cm apart; and two vertical columns at the point where two vertical edges overlap, with a vertical distance of 10-20cm and a column spacing of 10cm. Additionally, shear nails are inserted every 15cm along the outer edge of each hole. After the thin-walled retaining ring 300 for that cave layer is fixed, the hoisting rope is released, the cave scanning device 200 is removed, and the process is repeated for the thin-walled retaining ring 300 of another cave layer. This process is repeated until all cave layers are sealed.

[0078] Step 6: Pour concrete into the pile foundation.

[0079] This invention addresses the difficulty of obtaining the distribution of karst caves within each pile hole in existing geological surveys. It proposes a method for scanning karst caves within pile holes, establishing a two-dimensional coordinate system of hole wall coordinates and unit images to visualize the distribution of karst caves, and storing this data.

[0080] This invention addresses the problem of high support costs associated with the use of continuous steel casings for multi-layered karst caves. Based on the distribution characteristics of each layer of the karst cave, a corresponding thin-walled protective ring is designed and installed for each layer to prevent concrete loss during the pouring of pile foundation concrete.

[0081] This invention addresses the challenge of installing thin-walled retaining rings inside pile holes by inventing a shear nail pressing robot. Combined with scanned and stored data, the robot presses shear nails into the top, bottom, overlapping vertical edges, and outside the contours of each karst cave of the thin-walled retaining ring to fix it in place.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A visual sealing device for pile holes in beaded karst caves, characterized in that, include: Steel casing, cave scanning equipment, thin-walled protective rings, and shear stud installation mechanism; The steel casing is installed at the pile hole of the karst cave, and the karst cave scanning device is clamped on the top of the steel casing. The karst cave scanning device is used to scan and record the interior of the karst cave. After scanning, based on the information collected by the scan, multiple thin-walled protective rings are installed inside the karst cave pile holes to cover different karst caves; The shear nail installation mechanism is installed at the bottom of the cave scanning equipment and is used to fix the thin-walled protective ring inside the cave. The cave scanning equipment includes: a controller, a clamping mechanism, a telescopic rod, and a scanner; The clamping mechanism is telescopic, one end of the clamping mechanism is connected to the controller, and the other end of the clamping mechanism is clamped to the top of the steel casing. The controller controls the clamping mechanism to adjust the position of the controller axis. One end of the telescopic rod is connected to the bottom of the controller, which can control the telescopic rod to extend and retract; a scanner is installed at the other end of the telescopic rod. The thin-walled protective ring has retaining rings spaced apart on one side of its vertical edge. The other side is cut into a concave-convex shape, so that the protruding part passes through the corresponding retaining ring. Small retaining angles and large retaining angles are welded at each protruding position. A retaining rod is inserted between the retaining rings and the small retaining angles along the vertical edge of the thin-walled protective ring to achieve the purpose of making the thin-walled protective ring into a cylindrical shape. The width of the small retaining angle is smaller than the length of the inner short side of the retaining ring to ensure that the retaining rod can pass through the retaining ring when it is pulled out. The large retaining angle is larger than the length of the inner short side of the retaining ring to prevent the thin-walled protective ring from fully opening when the retaining rod is pulled out. One end of the thin-walled protective ring is clamped by an electrically operated clamp, and the other end is hoisted by a rope through a pulley into the karst cave layer in the pile hole. The rope is then used to lift the retaining rod, which allows the thin-walled protective ring to open and cover the karst cave layer.

2. The sealing device for visualizing pile holes in beaded karst caves according to claim 1, characterized in that, The cave scanning device also includes a reaction force device, which is installed on the telescopic rod. The reaction force device, through its support with the cave wall, prevents the scanner from shifting its position when scanning the cave wall.

3. The sealing device for visualizing pile holes in beaded karst caves according to claim 1, characterized in that, The scanner is equipped with a scanner gear, and the telescopic rod is equipped with a first telescopic rod gear. The scanner gear meshes with the first telescopic rod gear, and the controller can control the scanner gear to rotate, and the scanner rotates along the telescopic rod.

4. The sealing device for visualizing pile holes in beaded karst caves according to claim 1, characterized in that, The clamping mechanism includes a support arm and a clamping leg. One end of the support arm is connected to the clamping leg, and the other end of the support arm is connected to the controller. The support arm is telescopic.

5. The sealing device for visualizing pile holes in beaded karst caves according to claim 1, characterized in that, The thin-walled protective ring is a rectangular sheet of iron. The thickness of the thin-walled protective ring is greater than 2mm. The horizontal side length of the thin-walled protective ring is 20cm longer than the perimeter of the pile foundation, and the vertical side of the thin-walled protective ring is about 60cm longer than the length of the sealed karst cave layer.

6. The sealing device for visualizing pile holes in beaded karst caves according to claim 1, characterized in that, The shear stud installation mechanism includes a reaction seat, a positioning rod, and a pressing machine. The reaction seat is mounted on the telescopic rod. The positioning rod is telescopic, with one end connected to the reaction seat and the other end connected to the pressing machine. The controller controls the telescopic movement of the positioning rod to align it with the position where the shear stud needs to be driven in. The pressing machine can drive the shear stud through the thin-walled protective ring and into the hole wall.

7. The sealing device for visualizing pile holes in beaded karst caves according to claim 6, characterized in that, The telescopic rod is provided with a second telescopic rod gear, and the reaction seat is provided with a reaction seat gear. The reaction seat gear meshes with the second telescopic rod gear. The controller can control the rotation of the reaction seat gear, and the reaction seat rotates along the telescopic rod.

8. The sealing device for visualizing pile holes in beaded karst caves according to claim 2, characterized in that, The reaction force is provided in multiple units.

9. A method for visualizing and sealing pile holes in beaded karst caves, characterized in that, The sealing device for visualizing the pile holes at any of the beaded karst caves according to claims 1-8 includes the following steps: The karst cave scanning equipment is hoisted and clamped onto the steel casing, and the karst cave scanning equipment is adjusted so that it is located at the core of the pile hole; Turn on the cave scanning equipment to scan and measure the cave, record and store the information; A thin-walled protective ring is fabricated based on the scanning results of the cave scanning equipment. The thin-walled protective ring is rolled into a cylinder and placed inside the cave so that it covers the cave. The thin-walled protective ring is fixed using a shear nail installation mechanism until all the karst caves are sealed. Pour concrete into the pile foundation.

Images